If you are sure about that you know very little (or nothing) about actual gun handling.
Watch
this video. This is how drawing a gun from a holster is taught at Gunsite, one of our finest shooting schools. This is pretty much the gold standard technique. Notice that one starts by taking a full, firing grip on the gun, with the trigger finger
off the trigger and indexed along the frame before beginning to remove the gun from the holster.
Cocking the hammer during the draw is a technique used with single action revolvers when doing a "fast draw" -- these days done mostly for competition.
While some folks carry a single action semi-auto with the hammer down and thumb cock the hammer, that's fairly uncommon today. The standard method of carrying a single action semi-automatic is with a round in the chamber, hammer cocked and safety engaged.
I don't particularly like the idea of a moveable rear sight. Things wear or stick, so the proper regulation (adjustment) of the sights is compromised or subject to change.
The thing is that I don't see how your system adds anything. I think it's based on a lack of knowledge about the practical use of a handgun in a dynamic situation. You'd probably understand that better if you had some solid training in practical handgun use/competition such as IPSC or IDPA competition.
I've fires a lot of ammunition in formal, practical training, in IPSC competition, and in informal, dynamic practice. Looking back on all that shooting, I can't imagine any way your device could have been useful to me or improved my safety or performance.